.eslintrc.js

module.exports = {
  env: {
    es6: true,
    node: true,
  },
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:import/errors',
    'plugin:import/typescript',
  ],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
    sourceType: 'module',
  },
  plugins: ['@typescript-eslint', 'functional'],
  rules: {
    'prefer-const': 'error',
    'no-magic-numbers': 'warn',
    '@typescript-eslint/no-non-null-assertion': 'warn',
    '@typescript-eslint/no-non-null-asserted-optional-chain': 'warn',
    'import/no-cycle': 'warn',
    '@typescript-eslint/ban-types': 'warn',
    'import/no-default-export': 'warn',
    '@typescript-eslint/prefer-optional-chain': 'warn',
    'no-empty-pattern': 'warn',
    '@typescript-eslint/no-empty-function': 'warn',
    'no-constant-condition': 'warn',
    '@typescript-eslint/prefer-optional-chain': 'warn',
    '@typescript-eslint/ban-ts-comment': 'warn',
    'no-case-declarations': 'off',
    '@typescript-eslint/consistent-type-imports': ['error', { disallowTypeAnnotations: false }],
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-empty-interface': 'off',
    '@typescript-eslint/no-floating-promises': ['error', { ignoreVoid: true }],
    'no-unused-vars': 'off',
    '@typescript-eslint/no-unused-vars': [
      'error',
      { argsIgnorePattern: '^_', ignoreRestSiblings: true },
    ],
    'import/no-duplicates': 'error',
    'import/order': [
      'error',
      {
        'newlines-between': 'always',
        alphabetize: {
          order: 'asc',
        },
      },
    ],
    'import/no-unresolved': 'off',
    'functional/no-let': ['error', { allowLocalMutation: true, ignorePattern: '^mutable' }],
  },
  ignorePatterns: ['*.test.ts', '*.js'],
};